<!--
@license
Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->

<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../iron-scroll-target-behavior.html">

<dom-module id="x-scrollable">
  <template>
    <style>
      :host {
        display: block;
        font: 14px arial;
      }

      .scrollState {
        border-left: 1px solid #ccc;
        border-right: 1px solid #ccc;
        border-bottom: 1px solid #ccc;
        font-weight: bold;
        background-color: #eee;
        position: fixed;
        top: 0;
        left: calc(50% - 100px);
        padding: 10px;
        width: 220px;
        text-align: center;
      }

      .item {
        border-bottom: 1px solid #ccc;
        background-color: white;
        padding: 20px;
        width: 200%;
      }

    </style>
    <div class="scrollState">scrollTop: [[xScrollTop]] - scrollLeft: [[xScrollLeft]]</div>
    <template is="dom-repeat" items="[[_getItems(itemCount)]]">
      <div class="item">[[index]]</div>
    </template>
  </template>

</dom-module>

<script>
  Polymer({

    is: 'x-scrollable',

    properties: {

      xScrollTop: {type: Number, readOnly: true, value: 0},

      xScrollLeft: {type: Number, readOnly: true, value: 0},

      itemCount: {type: Number, value: 200}

    },

    behaviors: [Polymer.IronScrollTargetBehavior],

    attached: function() {
      this._scrollHandler();
    },

    _scrollHandler: function() {
      this._setXScrollTop(this._scrollTop);
      this._setXScrollLeft(this._scrollLeft);
    },

    _getItems: function(itemCount) {
      var items = new Array(itemCount);
      while (itemCount > 0) {
        items[--itemCount] = true;
      }
      return items;
    }
  });
</script>
